I got around to starting on our roof terrace. I used some bamboo, ornamental grasses and buxus. They have all started to go brown over the last couple of weeks and look like they are dying. I am watering them everyday. Am I watering them too much or are these plants not suitable for a roof situation and if not what can you recommend ?
If they are going brown, they are suffering a combination of drying from wind and not enough moisture. Even watering each day might not be enough if the quantity is not being delievred. The best solution is a permanent drip irrigation system and simple kits can be bought in garden centres. Connected to a tap these can be set to deliver the required amounts on a volume or timer basis.
If you go to out Plant finder in Know-how you can select a range of resistant types but phormiums, agapanthus, hebe, hypericum and olearia would be among the better choices.